add delimiter and transpose

[ghost]

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Motivation and Context / Related issue

How Has This Been Tested (if it applies)

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document and completed the CLA (see CONTRIBUTING).
• All tests passed, and additional code has been covered with new tests.

[facebook-github-bot]

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[facebook-github-bot]

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[lw]

Thanks for the contribution! This looks good to me, I'll merge it shortly!

[facebook-github-bot]

@lw has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[facebook-github-bot]

@illcat has updated the pull request. You must reimport the pull request before landing.

[ghost]

Please approve. @lw

[facebook-github-bot]

@lw has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@illcat has updated the pull request. You must reimport the pull request before landing.

[facebook-github-bot]

@lw merged this pull request in e63485a.

[lw]

I merged your changes to the delimiter but I didn't pick up your other changes. Could you submit another PR with those? Thanks